About R chart

[chrisboo]

I have write a program which can capture the live image from the
camera. Then, we use this program to calculate the contrast ratio and
the contrast ratio will continuously generate in our program. Then, I
want to use these data to plot a x bar chart and r chart. since the
data( numerial data only) generate continuously, I am very difficult
to plot r chart.
If you want more detail information, I can tell you.
Thanks